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Radiological Safety Assessment for KAERI Incineration Plant on the Basis of Trial Burn Results
양희철,김봉환,김창회,박원만,정명수,Yang, Hee-Chul,Kim, Bong-Hwan,Kim, Chang-Hee,Park, Won-Man,Jeong, Myung-Soo Korean Association for Radiation Protection 1998 방사선방어학회지 Vol.23 No.2
모의 및 실폐기물 시험소각 결과를 기준으로 한국원자력연구소 소각시설의 상용운전을 위한 방사학적 위해성을 평가하였다. 연간 정상운전을 통해 배출되는 방사성 물질로 인한 환경영향은 물론 가상된 사고시의 단기(2시간 기준) 배출로 인한 환경적 영향은 무시할 수 있을 것으로 평가되었으나 정상운전시에 배출되는 주배출원인 반휘발성 방사성 세슘의 농도는 공기중 허용농도의 10%를 약간 상회하는 것으로 평가되었다. 비방사능 세슘추적자를 포함하는 모의폐기물의 시험소각을 통하여 포대 여과기의 응축상 세슘성분에 대한 제거특성을 고찰하였다. 포대여과장치를 통과하기전 배기체내에 확산과 관성의 전이영역에 분포하는 입자상 세슘성분은 5%에 불과하였다. 포대여과기의 세슘성분에 대한 총괄제거효율이 99.9% 이상이어서 방사성폐기물 소각설비의 저온 배기체처리계통의 일차 여과장치로서 충분한 제염성능을 가짐을 보였다. Radiological safety for the conventional operation of Demonstration-Scale Incineration Plant (DSIP) was assessed on the basis of the results of trial burns using the simulated and real radioactive wastes. Radiation dose assessments for routine releases on an annual basis as well a several severe accidental releases on a short-term basis (2h) revealed that there would be no significant environmental impact when low-level waste Is incinerated in DSIP. For semivolatile radioactive cesium species, expected emission concentrations slightly exceeded 10% of maximum permissible concentration. Removal characteristics of the bag filter for condensed-phase cesium species was investigated by the trial burns of simulated waste with inactive cesium tracer. In the off-gas before passing through bag filter, distributions of condensed cesium species in the transition size ranging between the diffusional and inertial region are less than 5%. The overall collection efficiency of the bag filter for cesium species was higher than 99.9%, showing enough decontamination capability as a primary filter for the low-temperature dry off-gas system in radwaste incineration plant.
양희철(Hee Chul Yang),정재복(Jae Bock Chung),김명진(Myeong Jin Kim),송건훈(Kun Hoon Song),이종태(Jong Tae lee),유형식(Hyung Sik Yoo),정재준(Jae Joon Chung),강진경(Jin Kyung Kang) 대한소화기학회 1997 대한소화기학회지 Vol.29 No.3
N/A Background/Aims: To evaluate the value of CT prognostic factors in acute pancreatitis. Methods: In 48 patients with acute pancreatitis, clinical course and CT findings were analyzed retrospectively. Clinical severitv was classified as severe and mild form, based on the definition of Atlanta symposiurn. CT grades were classified as A, B, C, D, E and pancreatic necrosis as 0, 30,o, 50% & more than 50%. CT severity index(CTSI) was acquired by the sum of the points of CT grade(0, 1, 2, 3, 4 for each grade) and pancreatic necrosis(0, 2, 4, 6 for each degree of necrosis). Results: Among 48 patients, thirteen patients(29%) showed severe clinical course and the remaining(717o) showed a mild course. Patients with CT grade D & E were 63% among all patients,and 40% of these patients had severe form. Among 13 with severe form, acute fluid collection was observed in 92% patients. The common sites of acute fluid collection were anterior pararenal space and lesser sac. Pancreatic necrosis was observed in 29% of patients and 85% of these patients had severe form. CT grades of patients with pancreatic necrosis were D or E. The average CTSI for all patients was 3.5 and there was significant difference(p<0.01) between mild(2.5) and severe form(6.2). The sensitivity and specificity for severe form, when CTSI was greater than 4, were 85% and 94%. Conclusions: CT prognostic factors, including CT grade, pancreatic necrosis and CTSI, were useful for predicting the clinical course of patients with acute pancreatitis. (Korean J Gastroenterol 1997;29: 362-369)
양희철(Hee-chul Yang),김영봉(Young-bong Kim) 한국정보과학회 1998 정보과학회논문지 : 시스템 및 이론 Vol.25 No.8
대부분의 GIS 시스템에서는 지리정보의 표현을 위해 수치고도모델(DEM)을 채용하고 있다. DEM 데이타를 획득하는데 소요되는 많은 시간과 비용을 줄이기 위한 한 방법으로 일반 등고선 지도로부터 고도(높이) 정보를 얻는 기법이 종종 사용되어 왔다. 그러나, 일반 지도는 등고선과 함께 문자, 숫자, 그리고 기호들을 포함하고 있어 스캐닝한 영상에서 이들을 제거하면 하나의 폐등고선이 몇 개의 등고선 세그먼트로 끊어지게 된다. 일반 등고선 지도로부터 정확한 3차원 DEM 데이타의 구축을 위해서는 끊어진 등고선 세그먼트들을 폐등고선으로 복원해야 한다. 끊어진 등고선 세그먼트의 연결을 위해 Lee[l] 는 각 세그먼트의 끝점을 꼭지점으로 고려한 완전그래프를 그린 후, 최소 비용을 갖는 연결을 찾는 방법을 제안 하였다. 그러나 몇몇의 예에서는 정확한 연결이 이루어지지 않는 결점이 있다. 본 논문에서는 지도로부터 3 차원 지리 자료를 얻기 위해 문자, 숫자, 기호 등에 의해 끊어진 등고선 세그먼트에 레이블 값을 부여한 후 올바른 등고선 세그먼트의 연결을 찾는 방법을 제안한다. 두 이웃한 직선과 만난 등고선 순서의 유사성을 이용한 이 연결 방법은 끊겨진 등고선 세그먼트를 올바르게 연결한다. Most of GIS systems have employed a geographical data representation called as DEM(Digital Elevation Model), whose construction takes a lot of time and space. Obtaining DEM data from a paper-based map has been known as an effective methodology to reduce time and cost. But, various characters such as alphabets, digits, and symbols lying on contours may give rise to several critical problems. If we remove such characters, a closed contour will be splitted into several segments. The disconnected segments should be merged to get the height at each grid point which forms a DEM. Lee[l] proposed the cost function as a criterion to merge disconnected contour segments. However, the algorithm may not give good results for some cases. Therefore, we propose a method that extracts 3D geographical data from a typical map. In order to restore the contours divided by characters we assign a 레이블 to a contour segment and then solve the connection problem between segments. This proposed method leads to good connections for the cases that were not solved vet.